I bought this mount specifically to use the earmix in the live room when recording in a studio. its not too easy to mount the earmix but this bracket is exactly designed for the job. It's not cheap but it does work well. I could not find an alternative made by anyone except Presonus so I guess its this one or none!.
Pro's are that the mount is an exact fit and is very well made!
Con's are that the price is high for a bracket and there is no alternative.
Although it IS expansive, the bracket is important for my specific situation in a recording studio and for my needs I decided to live with the pricing so that the earmix in my situation could be used effectively.